diff --git a/addons/hr_timesheet_invoice/hr_timesheet_invoice_view.xml b/addons/hr_timesheet_invoice/hr_timesheet_invoice_view.xml
index debb84e0c7c..e97fcd0272a 100644
--- a/addons/hr_timesheet_invoice/hr_timesheet_invoice_view.xml
+++ b/addons/hr_timesheet_invoice/hr_timesheet_invoice_view.xml
@@ -24,7 +24,7 @@
                 </group>
                 <xpath expr="/form/sheet" position='before'>
                     <header>
-                        <button name="set_pending" string="Pending" type="object" states="open" class="oe_form_button_active_flow"/>
+                        <button name="set_pending" string="Pending" type="object" states="open" class="oe_form_button_return_flow"/>
                         <button name="set_close" string="Close" type="object" states="open,pending" class="oe_form_button_active_flow"/>
                         <button name="set_open" string="Re-open project" type="object" states="pending,close" class="oe_form_button_return_flow"/>
                         <button name="set_open" string="Re-open project" type="object" states="cancelled,draft"/>